import java.util.HashSet;
import java.util.Set;

public class SimpleHashSet<E> implements SetInterface<E> {
    private final Set<E> delegate = new HashSet<>();

    @Override
    public void add(E e) {
        delegate.add(e);
    }

    @Override
    public boolean contains(E e) {
        return delegate.contains(e);
    }

    @Override
    public int size() {
        return delegate.size();
    }
}
